From the Super Mario Wiki
First-Person View is an element that is exclusive to Mario Kart 7. When using this view, the player can tilt the Nintendo 3DS system to steer the kart. By pressing , the camera shifts from the back of the kart to the front with an emblem of the character who is currently racing on the steering wheel. If the player uses tilt-controls 80 or more times for his or her last 100 races, the steering wheel will become golden. However, if the player uses tilt-controls less than 80 times for his or her last 100 races, the wheel will revert back to normal.
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